Harbor Freight - Gems and Junk

2 items for today's post-

#1- my 2.5 ton low profile jack is still going strong after several years, and I've been using it a lot more this year.

#2- My manual pistol grip grease gun is becoming a PITA to use. Has anyone tried their $20 or $28 air powered gun?

Tractor supply also has a $26 Campbell Hausfeld I'm throwing in to the consideration mix.

I guess I have an item #3-

Anyone use their electrical knockout cutters? I need to cut one 1 inch hole to move a sub panel inside. @ $29 (minus the 20%) I get the whole set versus just one name brand cutter for that price.
I already have a 1/2 inch Greenlee (from my electrician apprentice days) brand but it would be nice to have a whole set, if they'll last more than one or two uses each.